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Separation method applicable to both propylene hydration and acetone hydrogenation for isopropyl alcohol preparation

A technology of propylene hydration and separation method, which is applied in the separation/purification of hydroxyl compounds, chemical instruments and methods, preparation of hydroxyl compounds, etc., and can solve problems such as failure to achieve effective separation and purification of high-purity isopropanol

Active Publication Date: 2016-06-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Failed to achieve effective separation and purification of high-purity isopropanol

Method used

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  • Separation method applicable to both propylene hydration and acetone hydrogenation for isopropyl alcohol preparation
  • Separation method applicable to both propylene hydration and acetone hydrogenation for isopropyl alcohol preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Propylene hydrated isopropanol crude alcohol 2 is treated in the deether tower 1, isopropanol and propylene dimer 4 are discharged from the top of the deether tower, and the bottom material 5 of the deether tower enters the concentration tower 6. Feed composition: water injection 3 is 70000 kg / hour; isopropanol is 12500 kg / hour; n-propanol is 125 kg / hour; 4-methylpentanol is 125 kg / hour; acetone is 32 kg / hour. The waste water 7 at the bottom of the concentration tower 6 is treated with cationic resin and anion resin and reused. The top material 8 of the concentration tower 6 enters the dehydration tower 9 from the 9th theoretical plate. The top material 8 is azeotropic alcohol (90# alcohol ). The dehydration tower 9 is provided with 35 theoretical plates, and the dehydrating agent is n-hexane. The material 11 at the top of the dehydration tower enters the water separation tank 12 after being cooled, the material 11 at the top of the dehydration tower is mainly a ternar...

Embodiment 2

[0062] Propylene hydration isopropanol crude alcohol production and composition are the same as in Example 1. Acetone hydrogenation isopropanol crude alcohol composition: 5000 kg / hour of isopropanol; 50 kg / hour of water; 6 kg / hour of isopropyl ether; 50 kg / hour of acetone; 50 kg / hour of 4-methylpentanol. The 11th theoretical plate of this material enters the dehydration tower 9. 17200 kg / hour of 99.99% m / m isopropanol is obtained in the side line of the weight-removing tower 23. Under this working condition, the heating load of the dehydration tower 9 is 14580 kilowatts, and the heating load of the weight removal tower 23 is 10090 kilowatts.

Embodiment 3

[0064] Acetone hydrogenation crude isopropanol enters dehydration tower 9 from the 9th theoretical plate, and other conditions are identical with embodiment 2, and weight removal tower 23 side line obtains 99.99% m / m isopropanol 17200 kilograms / hour. Under this working condition, the heating load of the dehydration tower 9 is 15380 kilowatts, and the heating load of the weight removal tower 23 is 10100 kilowatts.

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Abstract

The invention belongs to the technical field of petrochemical industry, and is a separation method suitable for preparing isopropanol by hydration of propylene and hydrogenation of acetone. The steps of the method are as follows: crude isopropanol produced by hydration of propylene passes through a deether tower and a concentration tower in sequence , the dehydration tower obtains anhydrous products; the water layer of the water separation tank of the dehydration tower is partially circulated back to the concentration tower, and part of it enters the acetone removal tower; the dehydration tower removes by-products isopropyl ether, 4-methyl pentanol and water and unreacted acetone , hydrogenation to produce crude isopropanol feed position can borrow hydrated isopropanol azeotrope to form the feed position, the feed position is located below the dehydration tower; the bottom material of the acetone removal tower is returned to the concentration tower for feed. The advantages of the present invention: provide a common isopropanol separation method for the two processes of propylene hydration and acetone hydrogenation, both of which can obtain isopropanol with high purity; compared with other processes, the process does not increase equipment and does not cause environmental pollution Pollution reduces production costs to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry and relates to a separation method suitable for hydration of propylene and hydrogenation of acetone to prepare isopropanol. Background technique [0002] Isopropanol is an important organic raw material and industrial solvent. Widely used in medicine, chemical synthesis, ink and other industrial fields. The production methods of isopropanol are mainly propylene hydration method and acetone hydrogenation method. Propylene hydration methods include indirect hydration and direct hydration. Propylene direct hydration is currently the main method for industrial production of isopropanol, which can be divided into gas-phase hydration, liquid-phase hydration and gas-liquid mixed-phase hydration. The gas-phase hydration method is represented by the Viba method developed by the German Viba Company; the liquid-phase hydration method is represented by the solution catalysis method of the Ja...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/10C07C29/76C07C29/80
Inventor 张玉东宋立红齐晓梅王春玲王英伟王中平
Owner PETROCHINA CO LTD
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